spec/unit/library_spec.rb

require "spec_helper"

module Omnibus
  describe Library do
    #
    # Helper method for generating a fake software definition.
    #
    def generate_software(name, version, dependencies: [],
                          build_dependencies: [], system_dependencies: [])
      software = Software.new(project, "#{name}.rb")
      software.name(name)
      software.default_version(version)

      dependencies.each do |dependency|
        software.dependency(dependency)
      end

      build_dependencies.each do |dependency|
        software.build_dependency(dependency)
      end

      system_dependencies.each do |dependency|
        software.system_dependency(dependency)
      end

      software
    end

    let(:project) do
      Project.new.evaluate do
        name          "chef-dk"
        maintainer    "Chef Software, Inc"
        homepage      "http://getchef.com"
        build_version "1.0.0"

        install_dir "/opt/chefdk"

        system_dependency "libc"

        dependency "preparation"
        dependency "erchef"
        dependency "postgresql"
        dependency "ruby"
        dependency "chef"
        dependency "chefdk"
      end
    end

    let(:library) { Library.new(project) }

    let(:bundler)     { generate_software("bundler", "1.5.4", dependencies: %w{ruby}) }
    let(:curl)        { generate_software("curl", "1.5.4", dependencies: %w{openssl zlib}) }
    let(:cmake)       { generate_software("cmake", "3.28.1") }
    let(:chef)        { generate_software("chef", "1.0.0", dependencies: %w{bundler ohai ruby}) }
    let(:erchef)      { generate_software("erchef", "4b19a96d57bff9bbf4764d7323b92a0944009b9e", dependencies: %w{curl erlang rsync}) }
    let(:erlang)      { generate_software("erlang", "R15B03-1", dependencies: %w{openssl zlib}) }
    let(:ncurses)     { generate_software("ncurses", "5.9", system_dependencies: %w{libgcc}) }
    let(:ohai)        { generate_software("ohai", "master", dependencies: %w{ruby rubygems yajl}) }
    let(:openssl)     { generate_software("openssl", "1.0.1g", dependencies: %w{zlib}) }
    let(:postgresql)  { generate_software("postgresql", "9.2.8", dependencies: %w{zlib openssl}) }
    let(:preparation) { generate_software("preparation", "1.0.0") }
    let(:rsync)       { generate_software("rsync", "3.0.9") }
    let(:ruby)        { generate_software("ruby", "1.9.3-p481", dependencies: %w{zlib ncurses}) }
    let(:rubygems)    { generate_software("rubygems", "1.8.24", dependencies: %w{ruby}) }
    let(:skitch)      { generate_software("skitch", "4.4.1", dependencies: %w{postgresql}) }
    let(:yajl)        { generate_software("yajl", "1.1.0", dependencies: %w{rubygems}) }
    let(:zlib)        { generate_software("zlib", "1.2.6", build_dependencies: %w{cmake}, system_dependencies: %w{libgcc}) }

    describe "#component_added" do
      it "adds the software to the component list" do
        library.component_added(erchef)
        expect(library.components).to eql([erchef])
      end

      it "does not add a component more than once" do
        library.component_added(erchef)
        library.component_added(erchef)
        expect(library.components).to eql([erchef])
      end
    end

    describe "#build_order" do
      let(:library) do
        library = Library.new(project)
        library.component_added(preparation)
        library.component_added(erlang)
        library.component_added(postgresql) # as a skitch trans dep
        library.component_added(skitch)
        library.component_added(erchef)
        library.component_added(ruby)
        library.component_added(chef)
        library
      end

      it "returns an array of software descriptions, with all top level deps first" do
        expect(library.build_order).to eq([
          preparation,
          erlang,
          postgresql,
          skitch,
          ruby,
          erchef,
          chef,
        ])
      end

      context "with a complex dep tree" do
        let(:chefdk) { generate_software("chefdk", "1.0.0.alpha", dependencies: %w{bundler ruby}) }

        let(:library) do
          # This is the LOAD ORDER
          library = Library.new(project)
          library.component_added(preparation) # via project
          library.component_added(erlang) # via erchef
          library.component_added(postgresql) # via skitch
          library.component_added(skitch) # via erchef
          library.component_added(erchef) # erchef
          library.component_added(ruby) # via project
          library.component_added(bundler) # via chef
          library.component_added(ohai) # via chef
          library.component_added(chef) # via project
          library.component_added(chefdk) # via project
          library
        end

        it "returns an array of software descriptions, with all top level deps first, assuming they are not themselves transitive deps" do
          expect(library.build_order).to eql(
            [
              preparation, # first
              erlang, # via erchef project
              postgresql, # via skitch transitive
              skitch, # via erchef project
              ruby, # via bundler transitive
              bundler, # via chef
              ohai, # via chef
              erchef, # project dep
              chef, # project dep
              chefdk, # project dep
           ]
          )
        end
      end
    end
  end
end